package com.heima.juc.n4;

import lombok.extern.slf4j.Slf4j;

import java.util.Random;

/**
 * @author : leimingchao
 * @date Date : 2022年01月11日 21:25
 */
@Slf4j(topic = "c.ExerciseTransfer")
public class ExerciseTransfer {

    /**
     * Random为线程安全
     */
    static Random random = new Random();

    /**
     * 随机 1~100
     * @return
     */
    public static int randomAmount() {
        return random.nextInt(100) + 1;
    }

    public static void main(String[] args) throws InterruptedException {
        Account a = new Account(1000);
        Account b = new Account(1000);

        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 1000; i++) {
                a.transfer(b,randomAmount());
            }
        },"t1");

        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 1000; i++) {
                b.transfer(a,randomAmount());
            }
        },"t2");

        t1.start();
        t2.start();

        t1.join();
        t2.join();

        //查看转账2000次后的总金额
        log.debug("total:{}",(a.getMoney() + b.getMoney()));

    }
}

class Account {

    private int money;

    public Account(int money) {
        this.money = money;
    }

    public int getMoney() {
        return money;
    }

    public void setMoney(int money) {
        this.money = money;
    }

    public void transfer(Account account,int amount) {
        synchronized (Account.class) {
            if (this.money >= amount) {
                this.setMoney(this.getMoney() - amount);
                account.setMoney(account.getMoney() + amount);
            }
        }
    }
}
